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Looks like no, there is no such method. I'm not sure why reassigning is 
allowed, seems wrong to me.

Also I see you're using nova floating ip API. If you have neutron 
enabled in your environment you should avoid using nova network-related 
methods. There is an equivalent neutron call for this:
neutron floatingip-associate
but it has the same behavior.

13.10.2016 1:16, Derek Wood пишет:
> Hi,
>
> I have a question regarding using the compute "action" API to assign a
> floating IP to a server
> (http://developer.openstack.org/api-ref-compute-v2.1.html#addFloatingIp).
> Using the API call below [1],  I am able to successfully assign a
> floating IP to a server, even if the floating IP is already assigned
> to another server.  My question is, is there a way or an equivalent
> API that will fail if the floating IP is already assigned to another
> node?
>
> My use-case is that I have a couple processes running in parallel,
> each provisioning instances with floating ips.  They often end up
> querying for the list of available floating ips around the same time,
> and request the same floating ip to be assigned to different
> servers... both succeed, and last one "wins".  I'd like to find an API
> call that will fail instead of reassign, so I can avoid implementing
> some sort of inter-process synchronization on the client side.  Any
> pointers appreciated.
>
> Thanks,
> -Derek
>
> [1] $ curl -s -v -X POST -d @addfloatingip.json -H "Content-type:
> application/json" -H "X-Auth-Token: $OS_TOKEN"
> https://[hostname]:8774/v2/$OS_TENANT_NAME/servers/[uuid]/action
>
> where addfloatingip.json:
> {
>      "addFloatingIp": {
>          "address": "[ip-address]"
>      }
> }
>
> where "ip-address" is a floating ip already assigned to another instance.
>
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